A numerical study is conducted to characterize the tip vortex unsteady evolution on a rounded-tip NACA0012 wing of aspect ratio operating at a Reynolds number of R e = 2.0 × 10 5 and an incidence of α = 8    deg . Stationary and plunging wing configurations are examined as representative problems of aircraft wandering, wing vibration, or structural compliance that may all drastically affect the nature of the tip vortex and have important consequences in applications of formation flight, for instance. The high-frequency ( k = 2.09 ) low-amplitude ( A = 0.02 c ) heaving motion of the wing promotes significant three-dimensionality of the overall flow structure with substantial variations in the tip vortex structure, including shear-layer substructure formation through enhanced separation and stretching, and alternating wakelike and jetlike behavior of its axial flow that leads to transitory enlargement or contraction of its core. The initial low-amplitude vertical displacement of the vortex grows dramatically as the structure advects into the wake, and a significant self-induced orbital motion results, which could be detrimental for downstream aerodynamic surfaces or for reliable vortex tracking in real-world applications. The dynamic state of the vortex as it leaves the wing is also shown to persist well into the wake.


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    Titel :

    Analysis of Tip Vortex Near-Wake Evolution for Stationary and Oscillating Wings


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 55 , 8 ; 2686-2702


    Erscheinungsdatum :

    01.08.2017




    Medientyp :

    Aufsatz (Konferenz) , Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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